Premium
Physical aging of even saturated monoacid triglycerides
Author(s) -
Whittam James H.,
Rosano Henri L.
Publication year - 1975
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02545091
Subject(s) - tripalmitin , van der waals force , chemistry , differential scanning calorimetry , activation energy , thermodynamics , transformation (genetics) , polymorphism (computer science) , chromatography , organic chemistry , physics , molecule , biochemistry , gene , genotype
The polymorphism and kinetics of phase transformations of triglycerides have been investigated using a polarizing microscope equipped with a variable temperature gradient stage. Differential thermal analysis, X‐ray, NMR, and IR data supplement the visual observations. The α‐polymorphic transformation was observed to change with time in the cases of trilaurin, trimyristin, tripalmitin, tristearin, triarachidin, and tribehenin and can be described by the equation:t = e ‐ K Δ T ‐ 1 .The greater stability of the α‐polymorph chain triglycerides can be attributed to the larger energy of activation needed for the transition to occur. Estimates of the energy of activation (14–76 kcal/chain) imply that, not only does the transformation process involve simple Van der Waals CH 2 ‐CH 2 interactions, but one must also consider chain‐chain entanglement.